Important Paper Biology
1: Select the correct combination of the statements (A-D) regarding the characteristics of certain organisms.
A. Methanogens are Archaebacteria, wind produce methane in marshy areas.
B. Nostoc is a filamentous blue-green algae which fixes atmospheric nitrogen.
C. Chemosynthetic auto trophic bacteria synthesize cellulose from glucose.
D. Mycoplasma lack a cell wall and can survive without oxygen.
A: B, C
B: A, B, C
C: B, C, D
D: A, B, D
Correct Answer: D
2: Which one of the following is the correct description of a certain part of a normal human skeleton?
A: Parietal bone and the temporal bone of the skull are joined by fibrous joint
B: First vertebra is axis, which articulates with the occipital condyles
C: The 9th and 10th pairs of ribs are called the floating ribs
D: Glenoid cavity is a depression to which the thigh bone articulates
Correct Answer: A
3: Vegetative propagation in Pistia occurs by
A: stolen
B: offset
C: runner
D: sucker
Correct Answer: B
4: The 3’-5' phosphodiester linkages inside a polynucleotide chain serve to join
A: One DNA strand with the other DNA strand
B: One nucleoside with another nucleoside
C: One nucleotide with another nucleotide
D: One nitrogenous base with pentose sugar
Correct Answer: C
5: Identify the components labeled A, B, C in the diagram below from the list 1 to 8 given along with
1. Cristae of mitochondria
2. Inner membrance of mitochondria
3. Cytoplasm
4. Smooth endoplasmic reticulum
5. Rough endoplasmic reticulum
6. Mitochondrial matrix
7. Cell vacuole
8. nucleus
A: 5 4 8 3
B: 1 4 8 6
C: 6 5 4 7
D: 5 1 3 2
Correct Answer: A
6: Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character.
A: The female parent is heterozygous
B: The parents could not have had a normal daughter for this character
C: The trait under study could not be colour blindness
D: The male parent is homozygous dominant
Correct Answer: A
7: Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?
A: Leghaemoglobin scavenges oxygen and is pinkish in colour
B: Nodules act as a site for nitrogen fixation
C: The enzyme nitrogenase catalysis the conversion of atmospheric N2 to NH3
D: Nitrogenase is insensitive to oxygen
Correct Answer: D
8: The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (a-d), the components of reaction labeled as A, B, C and D are identified correctly?
A: Potential Transition Activation Activation energy state energy with energy enzyme without enzyme
B: Transition Potential Activation Activation energy energy energy energy without with enzyme enzyme
C: Potential Transition Activation Activation energy state energy with energy enzyme without enzyme
D: Activation Transition Activation Potential energy state energy energy with without enzyme enzyme
Correct Answer: B
9: Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements.
(a) Wings of butterfly and birds look alike and are the results of (i) evolution.
(b) Miller showed that CH4, H2, NH3 and (i) , when exposed to electric discharge in a flask resulted information of (ii) .
(c) Vermiform appendix is a (i) organ and an (ii) evidence of evolution.
(d) According to Darwin evolution took place due to (i) and (ii) of the fittest.
A: (D)—(i) small variations, (ii) survival, (A)—(i) convergent
B: (A)—(i) convergent, (B)—(i) oxygen,(ii) nucleosides
C: (B)—(i) water vapour, (ii) amino acids, (C)—(i) rudimentary, (ii) anatomical
D: (C)—(i) vestigial, (ii) anatomical (D)—(i) mutations, (ii) multiplication
Correct Answer: A
10: Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D.
A: Nitrification Ammonification Animals Plants
B: Denitrification Ammonification Plants Animals
C: Nitrification Denitrification Animals Plants
D: Denitrification Nitrification Plants Animals
Correct Answer: B
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